The Frommer Stop is a Hungarian semi-automatic pistol which was manufactured by small arms firm Fegyver- és Gépgyár (FÉG) in Budapest.

The new variant was produced from 1919 to 1939, and was adopted by the Royal Hungarian Army under the name Pisztoly 19M and saw service during World War II.

The triggers were removed, and the guns were operated by a set of rods connecting to the spade grips of the mount, which directly engaged the sears.

The barrels were lengthened and the cocking mechanisms were redesigned as protruding arms, which were engaged by a set of hinged retracting levers.

The Frommer machine-pistol was succeeded later in 1917 by the more successful Steyr Arms Sturmpistole, (not to be confused with the German World War II flare and grenade launcher,) a direct copy of the Villar Perosa.